Program Menghitung Kebutuhan Ubin / Keramik Menggunakan Bahasa C++

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#include <iostream>
#include <cmath>

using namespace std;

int main() {
    float luas;
    double uk1 = 0.16, uk2 = 0.25, uk3 = 0.36;
    double jmldus, jmlkeping;
    int pilihan, balik;
    
    cout << "_______________________________________" << endl;
	cout << "|  Aplikasi Penghitung Kebutuhan Ubin |" << endl;
	cout << "|         www.minikoding,con          |" << endl;
	cout << "---------------------------------------" << endl;
    cout << endl;
    
    menu:
    cout << "Masukkan luas Area (dalam m^2): ";
    cin >> luas;
    cout << "---------------------------------------" << endl;
    cout << "Pilih ukuran ubin:" << endl;
    cout << "1. 40 cm x 40 cm" << endl;
    cout << "2. 50 cm x 50 cm" << endl;
    cout << "3. 60 cm x 60 cm" << endl;
    cout << "---------------------------------------" << endl;
    cout << "Masukkan pilihan              : ";
    cin >> pilihan;
    
    if (pilihan == 1) {
    	jmlkeping = luas / uk1;
        jmldus = jmlkeping / 6;
    } else if (pilihan == 2) {
    	jmlkeping = luas / uk2;
        jmldus = jmlkeping / 4;
    } else if (pilihan == 3) {
    	jmlkeping = luas / uk3;
        jmldus = jmlkeping / 4;
    } else {
        cout << "Pilihan tidak valid" << endl;
        goto menu;
    }
    	    
    cout << endl;
    cout << "------------------------------------------------------------------------------------------------------" << endl;
    cout << "|                                        Hasil Penghitungan                                          |" << endl;
    cout << "------------------------------------------------------------------------------------------------------" << endl;
	cout << "| Jumlah Ubin yang dibutuhkan: " << jmlkeping <<" Dibulatkan : " << ceil(jmlkeping) <<" Keping                                        |" <<endl;
	cout << "| Jumlah Dus yang dibutuhkan : " << jmldus    <<" Dibulatkan : " << ceil(jmldus)    <<" Dus                                           |" << endl;
	cout << "------------------------------------------------------------------------------------------------------" << endl;
	cout << endl;
	
    cout << "Apakah ingin hitung lagi ? (1=Y/0=tidak) : ";
    cin >> balik;
    if (balik == 1) {
    	cout << endl;
    	goto menu;
	} else if (balik == 0) {
		exit(0);
	}
    
    return 0;
}